Mrs. Geraldine W. Haupt, Color Expert of the National Bureau of Standards, testing a railroad signal glass to determine if the color value is true and to see that it conforms to specifications. Harris & Ewing, photographer, 1937. LOC original medium: 4 x 5 inch glass negative.

Locomotive engine of the South Dakota division, Chicago and North Western Railway Company at Tracy, Minnesota railroad depot. Detroit Publishing Company. Train photo taken between 1880 and 1930. LOC original medium: 8 x 10 in. glass negative.